add 2.42 ci

Author: Kyle-Kyle

.github/workflows/ci.yml

@@ -191,3 +191,16 @@ jobs:
         with:
           ubuntu: '25.04'
           glibc: '2.41'
+  v2_42:
+    runs-on: ubuntu-22.04
+    name: glibc-v2.42
+    steps:
+      - name: build how2heap
+        uses: shellphish/how2heap/ci/build@master
+        with:
+          ubuntu: '24.04'
+      - name: test how2heap
+        uses: shellphish/how2heap/ci/test@master
+        with:
+          ubuntu: '25.10'
+          glibc: '2.42'